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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f689eccb23f54af5b85f7600ff14719adbe4f1141f466e14152549005fea010' 
  AND token = 'Wb6GPewXVTPBOwsdjxcDLwawYgxj5mVv4GHGMyVzGAI=' 
  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"
    }
  }
}