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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb0706804936d8a98a221be3acde92bba3b60bf2571ca111e07dd1f8f6c4e36' 
  AND token = 'uQXDl62bJLpLVmh08mpwvd2vCmyaV5sKwICgd5xtdWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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