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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1991adc137a8fe0bcd26d6b1b4d1682d363996e40fc47a42bc3699ac0370ebba' 
  AND token = '3ZsG4bOJwFJVfz8D7CK9iLVtx4QrXCmPugo5aCGQIDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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