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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc9a0e074036427d2615624cc5a28d1dba914b4da99b6728c1af4d8d1c4aae3' 
  AND token = 'VxUgef/QyVJFCyG8mNNJlLEAcwhaBJkW0jhGI3cCAjQ=' 
  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"
    }
  }
}