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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3694c6663b637d1e9926d2f12bd1d9582ad778fea790f8c6c4062a843eacbd6' 
  AND token = 'UOCwzkuK1HETv2Dm6MxWoHO3I28e9PJqu1emzYPes4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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