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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53686e7daef2ea30a4dbd09c9e46d9671899ee902723cae07ed4bebb9de17b4f' 
  AND token = 'oCW03Erog9rpaKgRNPu2PZm3UjZfXJ2Y35R2/H66KzU=' 
  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"
    }
  }
}