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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8f4ec5ca8fe343cfa2834a1fbae5152c4b9d7e63a7a9ec398257c4a4e697c0' 
  AND token = 'Eym/q8BylaoS/CwrzGLbs0kIzlHIlMmr6TAWyD/OcF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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