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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794cc9ed959d4f599a2a6f3dd1d7d4c78f8abb78cf269497fcb8f7ba3f7b8a97' 
  AND token = 'DBpK/IECyW5XTTal4FYpithgSEdqLLPS0246YG3d4l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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