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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918796a03d0d30fe55c219f60e97826adc8e0d438c275c92549c7c8d947e1089' 
  AND token = 'SvMb4FHDeomz2sHEsPMypJLIdg35YTS3gIyRPquF2f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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