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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3968a5f45b19ee62177e5813dd57c1f9a401fe18d9554726f70ac875e2e357' 
  AND token = 'kkOYFwAUkjELkUo+8CCZUdJCNook6+TGOtEAFU+ls98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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