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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8dcef97d6e75029a09912aec102c33942768a7ea5475ec816fd60e8b9a9b5b' 
  AND token = 'eehfOIqRnDK+CLIKWovv7KAwXzsWnScozX+nI88BlFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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