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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e902fec74fd07da59ec9d724981e38e059a3974c25cba3ea0fe1354dd440e92b' 
  AND token = 'J9R7gazj7OWjsMQXQudPJpI9I3rGYsA5OxTc4gwAP/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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