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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd2ec1155ca0b14613c427bd46adbdc83db0d28e7f587223357230a17033e14' 
  AND token = '3Ba0g5V8K+NFe7Zmmoat16R8AZ9YEn4omISZYFYI6cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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