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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0ac5c8bd86c4ae595eb594653471a6b80455b7b8c9e5d5d0e8d4d5822791bb' 
  AND token = 'q52nA93oDGnjJd465NUC0GB9APubGucFaYdQTPMDvHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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