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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b256822198a5f6c88471320c3b7839aa4a5cffbd0dc6e9f9406b4d322c93febc' 
  AND token = 'WITkrYNRc64rbS8eYx9rE0RXYwwvo/c2SIr+LKao6uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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