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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336fb297c46867e929a670a9fccb412ceaa6b89d505762a619615d44ee158593' 
  AND token = '7/vbTd1fEn02GmCTwPnQy209Lg7Stcd0X+N2H4L+g9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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