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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3c715df669418ae1ade1fcda6127a898db60f5f75e0ced0ab4e2f79e6cb2d4' 
  AND token = '5K/8cgcH9ijiM1cIpWMGIZrXmV0FouPtalahnNPUMXk=' 
  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"
    }
  }
}