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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672eeba5f5b0c60a6e89cfd0ed8721700c1e082886e0db862bd07837ccf73d5f' 
  AND token = 'zO/3f2h7+QAh5CppAvJxEc6sFMkpv2EoOmYiCqeagwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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