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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25a84618c37a68df88b09b477aaa169ab69c4ba88fbd3933445f24c4302cab1' 
  AND token = 'GOJ8PQM55Uj27EhsB3S7uA82/bvSTUy/3N2TZN92Y7U=' 
  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"
    }
  }
}