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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e41a0e27c0e2ea8afdcf6ea86c485db3a00730e5012059e47dbaa0ab4e750d' 
  AND token = 'p41D/qPAdF01RHQJq+ICSj+kcR6ttSU/1XbAhIkitgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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