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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110c1cba5bbb35c480fb6d3781a4e59320a26876665ab3d76b8c17ff46ea13e3' 
  AND token = 'RPWzKAGTNZzRQ/C8ZUk92rGhiMTjf/TDxZIYyUY34rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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