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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79438d35163aaddd0b0581931404ba0a43d400d72b2576e589bd26c66b844388' 
  AND token = '2bw6LjJ10eosLpmSsXFRFWav2XBX/guEHFeTfTXhMlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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