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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f9e56e0c4e1a8d944f8175438ba4433998a93221b435b3a9e66d9f2b1fe17c' 
  AND token = 'iNiLJ3qCbWiuy6yB4Hvd14f2+wOpZcyPe9ciTETd78w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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