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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e1ca299640955be53c35f14a6ce3bae3ada8e087fca6f041a73e021920a76c' 
  AND token = 'IoMZr8RlX/FSmNLJQuVgvetx+Wg0vB7naJbmjw43P2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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