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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9743f4f80b4cadef6da5f450bf320df3bcd8d39de92ae370c467b22d76c8d4e' 
  AND token = 'mxS4FSzRZ6OC7j6AL6t6NyksaMCQiHSBQ1D2m+a9U2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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