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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790ed6aa76632fc4d7edea7352658ed5bb2f971b9546d94b1e39ddf1b655a8c4' 
  AND token = 'HlOE85pj1j5UZfm0AYCVitx13ApIYmVqyJNSh6gyWFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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