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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b4ac5e1e47a6e5eab9e0c2c61c8638ef77b326fbd915699571e581e2216ec5' 
  AND token = 'QyL2gTtBkotCFi4RbT8qHP0JsRFtvCGdwu5CTACPC2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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