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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f5c75bb78a4cf84b0430acad8e8b65625bfc49158e9ba24949f97e9e9fd484' 
  AND token = 'kMvJjb5ouX1QupSri6KeUbprxoAFiL7pzCY68lR0vw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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