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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63891cf3d5f60aa68b5617acf5259eb851d5870e38e89aaa0136a033511009e' 
  AND token = 'PiqDM7YsvgLq1x/3VUgB3RaQfHf0LSP2Zxd1sPV2GqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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