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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014e06a8f9d720d20bc4f42f70eec33fa990537156b59101c24f43610eb54521' 
  AND token = 'G29xBxpxI5TqzNBmJXcERaVgox7UTxItWVUebHltbC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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