Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c378313eaf0f4eabcaf00aebaf5dc4694064b8d6607b83b2137ba06764527c4c' 
  AND token = 'rmkP8F4x85M5n8ngF7+G4pbq2JJtii54PDTHeni8eo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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