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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffd04d48e773951b4572dbfd8309bebe4fc9b7a201629d5d275bb7ad5e33311' 
  AND token = '13AdAcJmiwrd+LOkS6kAPHd4RO8u2vP6r7OeOa6QJXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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