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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dd11e8e2b5342e520991ec4cafe2476ae8c46ac517dd020e0606547a976610' 
  AND token = 'E3anb+No0iii2xKsdNN8fQMvUEM5V8YsHwJxloUJQoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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