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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a702a72060b05bab697ed2d492347e7d5ec34cd58f79acb4a1ea4c35471b833b' 
  AND token = 'tdrqWDmO/5hGeNfEDDfOcskKQoHgSE9FL8UI5Dapp7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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