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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca39fb9cbf3de45e231a9f4a456a763656cd0c789c53cd7a2cf6002bad569a8' 
  AND token = 'di3xzcJbHLl3T3el1QUGF/odj1PS0Cy1hXPYaZnEn/M=' 
  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"
    }
  }
}