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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738973c7555ccf16c9a6efaa6c95d15ca3e4f88fa3bb1382e609ded24d9dd76b' 
  AND token = '+a0h8QetClPyxSjcUNNd4gJavBHfBFvCx4/e+l1/TeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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