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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acf8d8e3a3adb97f0bddf20d6f91ad232ac9710fc3c6a9ad1b283cf9c5fb7b8' 
  AND token = 'X+PayGp1GInC89Xe4kgMHwYL4J8EKxpt9PUKwGSSX+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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