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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38d7ebb6220a3b913f96fc2f3dd2cead2d54f59c34e9ddab8acfd42dc17c835' 
  AND token = 'QdQcNhs7ckI2H/Lq/qDrue3qr/t/dxq3PihpgbHRruc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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