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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19fd28bb4e9fe17c045f72a33bbf9bf2290d3f9b97e81f5cce371105b306575' 
  AND token = 'uvUsSGMjPifhpGM4TD0RifghWTHeLtqDfO4pkBW02bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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