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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d951fdedb28f674ee0bccdf4fa9ca512f1be361e8aca42d36aedebe3d767d8' 
  AND token = 'Hz6oCxrepni/D5/wnBlEfgSp/Yehg+A0l5ZqdEoESIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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