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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f178491dbb98daa920d1d35bab730247db58ba97cdc1ae50c8adc5ed8f5215' 
  AND token = '0TECByMUMJcMXIAXvWuiFVk+SQIP8MRwH7vJ6G2u38Y=' 
  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"
    }
  }
}