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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9e549d2cadfdf4b6cef813c6ff1c942f9f8b19672e180c37b60704b0095c4e' 
  AND token = 'rfb3B/U+T5FTSbXAGZl7Vi3EOWzv1a+Jt/+Fc7EkEDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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