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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ffffc734f55b3561ffb1a7c4feb91bee0b4d96358312edc3ea772fff561b32' 
  AND token = 'GriVrin1eyOGuaX4HASRXPZGq/bgIBK8gXxxn4jlljQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}