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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5faf0e1b9516f1d2bc43831aec615921ab9fa82f87815561a132310324fc14' 
  AND token = 'rCvG/uf3zbpsHvJwDV5/fT+FsWrpPQX2fbip2QJvDOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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