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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e0a3075d029201d87e14d692eb70005887df1ef4db8cae88e82149df893cf5' 
  AND token = '0yqEzTHU4hWuBHZNV3Wnf+6vH5ACmeyk7yj5PgK+Af0=' 
  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"
    }
  }
}