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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746e71fc26e75338cc3ca625201b1455e742370ed8c4aea449ccd67c67145632' 
  AND token = 'qIE93U/Pw3jwhYMBHpU6oa+fjEs4cOzdtvjm3z3U7BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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