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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1d8a27b3b35104037b4dea0615af022e972ce9adf720e53f77d8625194c31a' 
  AND token = 'zCkOIgnIBuY5AnDQ98qtQfkqTRMOsImaeu6l65R+mi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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