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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2d02d0c21252bbff0d7edba58f1ef8ee292c31eb4a87ceb355726ea8621050' 
  AND token = 'L95n83D8bgxaaW+7Zp9hx1qzjXkBRST2SViZ9X4wF28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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